AMDGPU: Fix kernel argument alignment impacting stack size

Don't use AllocateStack because kernel arguments have nothing
to do with the stack. The ensureMaxAlignment call was still
changing the stack alignment.

llvm-svn: 273080

1 files changed, 15 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.h b/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.h
index 2ef3bf5f2fb..a534024dc2e 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUMachineFunction.h
@@ -16,10 +16,25 @@
 namespace llvm {
 
 class AMDGPUMachineFunction : public MachineFunctionInfo {
+  uint64_t KernArgSize;
+  unsigned MaxKernArgAlign;
+
   virtual void anchor();
 
 public:
   AMDGPUMachineFunction(const MachineFunction &MF);
+
+  uint64_t allocateKernArg(uint64_t Size, unsigned Align) {
+    assert(isPowerOf2_32(Align));
+    KernArgSize = alignTo(KernArgSize, Align);
+
+    uint64_t Result = KernArgSize;
+    KernArgSize += Size;
+
+    MaxKernArgAlign = std::max(Align, MaxKernArgAlign);
+    return Result;
+  }
+
   /// A map to keep track of local memory objects and their offsets within
   /// the local memory space.
   std::map<const GlobalValue *, unsigned> LocalMemoryObjects;